Absolute determination of Se-79/Se-80 with AMS

作者：Wang, Wei^*; Ruan, Xiangdong; Lu, Liyan; Gong, Jie; Wu, Shaoyong; Zhang, Dawei; He, Ming; Jiang, Shan

来源：Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms , 2010, 268(7-8): 764-768.

DOI：10.1016/j.nimb.2009.10.025

• Se-79
• Isobar suppression
• Absolute determination
• Accelerator mass spectrometry (AMS)

Selenium-79 measurement with accelerator mass spectrometry (AMS) is increasingly being used for the determinations of Se-79 relevant nuclear data. Furthermore, Se-79 was deemed to be an ideal tracer nuclide for long-period and non-intrusive biological studies on selenium. An ultra-sensitive AMS measurement method of Se-79 has been established at the CIAE-AMS system. For further applications of Se-79-AMS, reference standards were requested. Se-79 can be derived from the Se-78(n, gamma)79Se reaction but cannot be accurately quantified by theoretical calculation owing to the small and dubious cross section and other relevant parameters. In this paper, an AMS method has been developed for the absolute determination of the Se-79/Se-80 ratio in a Se-79 sample with relatively high Se-79 content. The relative standard uncertainty of Se-79/Se-80 ratio is 4.7% and a reference standard is thus acquired. The results are favourable for further applications of Se-79-AMS.

• 出版日期2010-4
• 单位中国原子能科学研究院; 广西大学